DCA vs Lump Sum Calculator

You have a sum of money. Invest it all today, or spread it out? Same budget, same time, side by side — see the exact difference.

With $60,000 and a constant 7% annual return over 10 years, investing everything today (lump sum) could grow to about $120,580, while spreading it out monthly (DCA) would reach about $86,542 — a difference of roughly $34,037. Lump sum wins in this constant-return model because every dollar spends more time in the market. In reality, dollar-cost averaging reduces the risk of investing right before a downturn. Adjust the budget below to compare both strategies.

Your budget

Calculations run in your browser. Inputs are not stored.

Total to invest

Annual return

Illustrative assumptions only. Adjust the rate for your own model.

DCA frequency

Time horizon

10 years

DCA spread: $500/month over the full period.

After 10 years

Dollar-cost averaging

$86,542

Invested $60,000 · Growth $26,542

Lump sum

All upfront

$120,580

Invested $60,000 · Growth $60,580

DCALump Sum

Show yearly breakdown

Year	Contributions	DCA	Lump Sum

The default 7% is an illustrative nominal annual return before inflation, not a forecast or a historical real return. If inflation adjustment is enabled, it is applied once to the nominal result. Do not subtract inflation again from an already real return.

How this comparison works

The model

Both paths invest the same total over the same period at the same annual return. Lump Sum invests everything on day one. DCA invests an equal amount each month:

Lump Sum: FV = T · (1+i)^N
DCA: FV = M · ( ((1+i)^N − 1) / i ), M = T / N

T = total to invest · M = monthly amount · i = monthly rate · N = number of months.

Important limits of this model

Assumes a constant annual return — no volatility, no crashes, no sequence-of-returns risk.
Does not include taxes, inflation, fees or dividend timing.
With any positive constant return, Lump Sum mathematically always wins, because every dollar is invested longer.
In real markets DCA's value is risk reduction, not higher expected return. This tool shows the pure math, not a recommendation.

View the formula →

Educational purposes only. Not financial advice. See the full methodology and disclaimer.

Annual-price-return approximation (1928–2025)

The constant-return model above isolates the pure math. The section below approximates lump sum and monthly investing using annual S&P 500 price returns. It is not actual monthly DCA history or a monthly total-return backtest.

Approximation settings

Calculations run in your browser. Inputs are not stored.

Investment period

Total to invest

Lump sum invests the full amount on day one. DCA invests the same total at the end of every month.

Annual-price approximation: 89 complete 10-year windows (1928–2025)

Lump sum average$25,359

DCA average$17,963

Lump sum wins 84.3% of 89 modeled windows

Started	Lump sum	DCA	Winner

Method. Every calendar-year window between 1928 and the most recent complete period is tested. Lump sum puts the full amount in at the start and compounds through each year’s return. DCA invests the same total in equal monthly installments at month-end, compounding through each year’s monthly-equivalent return. Annual returns are S&P 500 price returns (dividends not reinvested), so these results omit dividend income. Each annual return is spread into twelve identical monthly-equivalent returns using (1 + annual return)^1/12 − 1. This smoothing removes within-year price paths, volatility and actual purchase-date effects. It cannot establish the historical win rate of actual monthly DCA. Incomplete 2026 data is excluded. Data: S&P 500 annual returns, 1928–2025, via History of Market / S&P Dow Jones Indices.

What this shows. Within this approximation, outcomes depend on the annual sequence and the modeled contribution schedule. Smoothed monthly paths can materially change the comparison with real purchases. DCA reduces the risk of investing a lump sum just before a downturn: it’s a risk trade-off, not a return-maximizing trick.

Lump sum vs DCA, explained

Why does lump sum usually win?

In this model every dollar is invested from day one and compounds for the whole period, while DCA dollars enter the market gradually. With a constant positive return, money invested sooner always ends up with more.

So should I always invest a lump sum?

Not necessarily. The calculator assumes no volatility. In real markets lump sum has historically won on average, but it carries more risk — if the market drops right after you invest, DCA would have bought at lower prices. The right choice depends on your risk tolerance.

Does this calculator include market volatility?

No. It's a constant-return model that isolates the pure math. It ignores volatility, dividend timing and sequence-of-returns risk, so real outcomes will differ.